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The stage features the four chambers of the Kalos Pokémon League: the Blazing Chamber, Dragonmark Chamber, Ironworks Chamber, and Flood Chamber, as well as the Main Hall. Similar to both Pokémon Stadium stages, the stage transitions into each chamber one at a time before reverting back to the Main Hall, at which point another chamber is randomly chosen and the process continues. Every variation features a main body with two platforms of some kind: during a stage transition the upper platforms quickly float up past the upper blast line, KOing any character still on them.

Each room can randomly appear in two versions: a normal one, with some Pokémon matching the room's type appearing in the background, and a rare one where a single Legendary Pokémon appears causing disruptive effects.

In the Dragonmark Chamber, Dragon-type Pokémon Garchomp, Hydreigon, Axew, and Dragonite appear. At regular intervals, three times in the course of the transformation, the giant dragon statue in the far background roars, causing damaging purple flames to erupt from the floor. Each blast does 15% with decent knockback.

The Chamber's Legendary Pokémon is Rayquaza: occasionally a trail of electricity crosses the screen, a warning that Rayquaza is about to travel in its path. Its attack is similar to its dashing during its Subspace Emissary battle in Brawl. If Rayquaza is present the dragon statue remains still and no bursts occur.

In the Blazing Chamber, Fire-types Infernape, Tepig, Blaziken, and Male Pyroar appear. The two platforms are supported by pillars of fire, which sear whoever touches them dealing 4% damage per hit. Two flaming spouts also appear at the sides of the stage.

The Chamber's Legendary Pokémon is Ho-Oh: when it shows up, the flames in the stage flare up and raise the platforms and the lateral bursts have increased intensity.

In the Ironworks Chamber, Steel-types Klinklang, Steelix, Scizor, and Honedge appear. When the stage transitions into this room a pair of huge swords plunge into the stage, damaging anyone on contact; their cross-guards serving as platforms. Touching their blades at any time deals 4% damage with minor knockback (metal fighters do not flinch from this); however it is possible to get juggled between them when they rise back up at the end of the transition. Attacking the swords also makes them sink further into the stage. At times, a puddle of metallic liquid appears in the center of the stage: if anyone touches it, they will become metallic for a short while.

The Chamber's Legendary Pokémon is Registeel: it attacks once by shaking the ground, causing the sword platforms to leap out and spin before falling back into place, damaging fighters. Fighters on the ground during its attack will be buried into the stage. If Registeel is present no metal pool appears.

The Ironworks Chamber, with the metal pool at its center. The right sword has been plunged into the ground by attacks.

In the Flood Chamber, Water-types Piplup, Wailord, Blastoise, and Clawitzer appear. When the stage transitions into this room two ramps appear from the sides, connecting the main body of the stage to the side blast zones. Periodically, a strong stream of water crosses the entire stage, carrying away any players caught into it: if they don't react they are likely to be flushed beyond the lateral blast zone. Buried and frozen characters will not be carried away with the current.

The Chamber's Legendary Pokémon is Manaphy: it turns the main platform into a sink, whose strong current can carry characters down to the lower blast line. If Manaphy is present no stream appears.

The Omega version of the stage is situated at the Main Hall minus floating platforms. In 8-Player Smash, the lighting seems to be darker than usual. Before version 1.1.3, wall jumping was strangely not possible on the Omega version of Kalos Pokémon League, but was on the normal version.

The first of the chambers is called the Ironworks Chamber, which houses Wikstrom, a Steel-type specialist dressed as a knight. Scizor and Aegislash, Honedge's final evolution are among his Pokémon. During his introduction a large pair of swords falls from the ceiling and plunges into the ground.

The second chamber is called the Dragonmark Chamber and contains Drasna, a Dragon-type specialist from Sinnoh. During her introduction a large dragon statue in the Chamber's background spreads its wings and raises its head, after which purple flames erupt from the burners in the room.

The third chamber is called the Flood Chamber, which houses Siebold, a Water-type specialist who takes great pride in battling and the culinary arts. Clawitzer is one of his Pokémon. During his introduction a couple of locks open and flood the Chamber with water.

The fourth chamber is the Blazing Chamber, which houses Malva, a Fire-type specialist who also works for Team Flare. Pyroar is one of her Pokémon. During her introduction two huge pillars of fire erupt from the ground.

There is one more chamber in the original games, which is not featured in Smash: the Radiant Chamber, where challengers can face Diantha, the Champion.

Due to the stage constantly transforming, the deadly platforms and the large number of highly intrusive stage hazards (particularly those of the Ironworks Chamber and the Flood Chamber), this stage is universally banned.

Registeel is the only Legendary Pokémon to appear on this stage that has not been a part of gameplay in previous games, with Rayquaza being a boss in The Subspace Emissary and Ho-Oh and Manaphy previously being Poké Ball Pokémon.

All the Pokémon in the background of the Dragonmark Chamber are part of evolutionary families used by at least one Champion in the Pokémon series.

If Jigglypuff is Star KO'd when the stage transitions, its eyes will disappear. It can be seen here.